Public spaces serve as the sensory system of urban life, and are crucial for interconnecting individuals, ideas, and cultures within the fabric of cities. This study provides a fresh interpretation of public spaces by examining people’s activities from a new perspective. By applying play theory to public space analysis, the study uncovers spontaneous and unplanned activities and the novel relationships which exist between users and their environments. In so doing it paves the way for a new approach to public space design. With a focus on Aachen as a place of play, this study seeks to develop urban design tools that take into account users’ leisure time activities. By recognizing the unique relationships that play can create between individ...